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Overnight cooling fails to protect older adults from daytime heat (opens in a new tab)

news-medical.net · 2026-09-30

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The source study

Effects of a 3-day simulated heatwave on physiological and functional outcomes in older adults in Canada: a single-site randomised crossover trial

The Lancet Planetary Health · 2026
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Source paper

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The 2 papers the story cites

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  • The study this story reportspresented as the new finding

    Effects of a 3-day simulated heatwave on physiological and functional outcomes in older adults in Canada: a single-site randomised crossover trial

    The Lancet Planetary Health · 2026

    Publisher (opens in a new tab)
  • The study this story reportspresented as the new finding

    Effects of a 3-day simulated heatwave on physiological and functional outcomes in older adults in Canada: a single-site randomised crossover trial

    Where the story links (opens in a new tab)
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Claim by claim

The source study was found, but the study's evidence could not be profiled, so these claims couldn't be checked.

Claim 1 of 8Not checkedCooling a home overnight may not be enough to protect older adults from the physiological effects of repeated daytime indoor overheating during a multi-day heatwave, according to new research from the University of Ottawa.View evidenceHide evidence

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The source study was found, but this claim couldn't be checked against it.

Claim 2 of 8Not checkedThe study was described as the first controlled trial to examine how older adults physiologically respond across both daytime heat exposure and overnight recovery periods of a simulated multi-day heatwave.View evidenceHide evidence

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The source study was found, but this claim couldn't be checked against it.

Claim 3 of 8Not checkedThe trial involved 18 adults between the ages of 67 and 84 from the Ottawa-Gatineau region, with equal numbers of women and men, staying in a specialized studio-apartment-style climate chamber across three consecutive days and two nights.View evidenceHide evidence

As stated18 adults, ages 67 to 84

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The source study was found, but this claim couldn't be checked against it.

Claim 4 of 8Not checkedDuring the simulated heatwave, the apartment was kept at 34°C during the day and cooled to 26°C overnight; in a separate comparison session, it remained at 26°C throughout the day and night.View evidenceHide evidence

As stated34°C daytime, 26°C overnight

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The source study was found, but this claim couldn't be checked against it.

Claim 5 of 8Not checkedOn the hot days, participants' peak core body temperature averaged 37.8°C versus 37.4°C under cooler conditions, heart rates were about five beats per minute higher, and blood tests showed higher circulating markers of kidney and gastrointestinal stress.View evidenceHide evidence

As stated37.8°C vs 37.4°C; about 5 bpm higher

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The source study was found, but this claim couldn't be checked against it.

Claim 6 of 8Not checkedResearchers also observed lower blood pressure and cardiac autonomic function, along with small declines in balance and cognitive test performance.View evidenceHide evidence

As statedsmall declines

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The source study was found, but this claim couldn't be checked against it.

Claim 7 of 8Not checkedAlthough overnight cooling to 26°C allowed most physiological responses to recover to near-baseline levels, recovery was not complete: lower morning systolic blood pressure and elevated markers of kidney stress remained evident the following mornings.View evidenceHide evidence

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The source study was found, but this claim couldn't be checked against it.

Claim 8 of 8Not checkedThe article says the findings reinforce Health Canada's June 2026 guidance recommending an upper indoor temperature limit of 26°C for older adults during extreme heat.View evidenceHide evidence

As stated26°C

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Effects of a 3-day simulated heatwave on physiological and functional outcomes in older adults in Canada: a single-site randomised crossover trial

The Lancet Planetary Health · 2026

Source record (opens in a new tab)

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Papers considered

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Crossref, PubMed, Europe PMC · 33 candidate papers

Selected

Effects of a 3-day simulated heatwave on physiological and functional outcomes in older adults in Canada: a single-site randomised crossover trial

The Lancet Planetary Health · 2026 · Crossref

Source (opens in a new tab)
Candidate

Thank you to The Lancet Planetary Health's statistical and peer reviewers in 2025

The Lancet Planetary Health · 2026 · Crossref

Source (opens in a new tab)

And 27 more candidates considered.